Previously, we built a latch that could store one bit of data. We’ve also seen how a trap 
can store a bit by trapping a marble.
Most computers need to store more than a single bit of data[citation needed]. Therefore we need a good way to store multiple bits.
This register stores 8 bits (1 byte) by cycling them in a loop.
As we stream in 
from a reservoir, it reads each bit from the register, “cloning” the data in the register on a loop.
Usually we think of memory as something that stays in place, but with roons it’s often easier to keep our memory flowing in a loop. This way, we don’t have to physically move the memory when we want to read it — we can just wait until the right time to read it. In this case, we need to make sure we’re reading the register at the start of its 8-step loop.
dynamic registers
As with our first latch, this register is read-only — once we’ve set it, we can’t change it. We’d like a way to write new values into the register. To accomplish this, there’s another device we’ll need to build first.
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